blasdell



Nera ra H. BLASDELL, OF NEW YORK, N. Y.

MILL FOR GRINDING QUARTZ.

Specification of Letters Patent No. 8,670,l dated January 20, 1852.

T0 all whom t may concern Be it known that I, I-IoRA'rIo BLASDELL, ofthe city and county of New York and State of New York, have invented anew and useful Improvement in Metallic Mills for Reducing GOldQuartzRock to a Flour, called Blasdells Gold-Quartz Flourer, and I do` herebydeclare the following to be a full and clear description of theconstruction and operation thereof, reference being had to the annexeddrawings, making part" of this specication'.

Figure l represents a side elevation of the mill. Fig. 2 is a verticalcentral section t-hrough the same. Fig. 3 is atop view of thesemispherical runner, with its channeled circular ring plate. Fig; 4 isan inverted View of the stationary concave, and channeled circularpringplate. Fig. 5 is an elevation of Fig. 3. Figi 6 is avertical'section ofthe case or shell- 'showing the hopper,

\ throat, and grooved! concave.

Where the same `letters of reference occur onthe several figures theyindicate the same' parts.

The arrow Fig. 3 shows the direction of the turning of the runner.

The distinguishing feature of improve.- ment consists in so constructingand coinbining the several parts of the mill, that the quartz rock shallbe received and cracked or reduced so as to pass between the groovedsurfaces of the semi-spherical runner, and concave, wherein the quartzis held and the particles thereof made to `act by friction directly uponeach other, and thus effect its own pulverization, and allowed todescend or case is mounted a frame F, in the upper;

portion whereof are the journal boXes of a horizontal shaft G, on oneend of which is a pulley H, from which the `band leads to the drivingpower, and on the opposite `end is a fly or balance wheel I, forequalizing the motion of the mill. Near the pulley H, on

the shaft G, is a bevel pinion J, matching with a horizontal bevel gearwheel K, on the upper end of the spindle or shaft L.

M is a lever having its fulcrum in the spider frame at N, and furnishedwith a screw rod O, projecting through a pillar b and provided with ascrew nut (o) whereby the wrought iron step or ink for the shaft L, andmounted upon the lever M, is raised or lowered for adjusting these1nispherical runner to the concave.

P is a spider frame attached to the bed piece A, for retaining thewrought iron step or ink in a vert-ical position. Q, is a horizontalplate for retaining the upper end of the shaftin an upright position.The throat of the case or shell is furnished `with a' chilled ironthroat or hollow cylinder R2 having its inner surface cast with verticalchannels and convex swelling as shown in Fig. 4, and having ribs r onits circumference which fit corresponding recesses in the throat andthus prevent the hollow cylinder from turning. The semi-sphericalconcave E, is furnished with a separate chilled iron ring E2 being asection of a sphere near the diameter thereof, and fitted securely intova corresponding recess cast around the larger diameter of the concaveE, and held in its place by ribs fitting recesses in the shell. Thisseparate chilled ring is provided with grooves l on lines drawn from thevertex to the base, and coincident with similar grooves formed in theupper `portion'of the concave-each groove beingof a'concave form.

B is a flat chilled 'iron ring plate bolted to the under surface of thehorizontalflange of the shell or case B, and fitting against the loweredge of the grooved ring E2'and by which thelatter is held in its place.This ring plate R, is channeled radially on its under surface Fig: 4 toa sufficient depth the sides (c) of said channels being tangential tothe dotted circle f Fig. 4. These channels are made slightly wider neXtto the concave chilled grooved vring E2 than at the circumference of thering plate, for receiving the pulverized quartz as it descends from theconcave. The heads of the screw bolts which confine the chilled ring`plate R are flush with the bottoms of the channels and the nuts arescrewed down upon the flange of the case B.

S is a chilled iron nut fitted to the square portion of the shaft L, andturning in the chilled iron ring W, fitted into a recess in the runnerT, and held securely thereon by projections and having groovescoincident with those in the runner. On the projecting flange U of therunner there is confined by screw bolts t a flat chilled iron ring Xhaving radial channels in its upper surl face one of the sides e2 beingtangential to the dotted circle f2 F ig. 3,-and of the form of thechannels of the stationary ring R.

; The inner or smaller diameter of the ring plate X, fits against theperiphery or larger diameter of the convex grooved ring W,

'whereby the latter is held securely in its place on the runner. Thereis a space beitween the outer diameter o-r periphery of the ring plate Xand interior of the case or curb B for the passage of the quartz afterbeing reduced to a flour. The channeled surfaces of the flat ring platesR X, are

' a nearly in contact with each other-and the ohannels of one platecross those of the pther diagonally during the rotation of the runner,whereby the tangential sides (e e2) of said channels are made to havethe effect @of checking the passage of the quartz through the channelsand working or whirling the quartz centrifugally between the ring platesR X and allow it to pass over the edge of the rotating ring plate X.

The employment of the separate chilled iron grooved rings E2 W, and thehorizontal circular channeled plates R X in combination with thesemi-spherical runner and concave enables the operator to renew theseportions when worn away without the necessity of renewing any other partof the mill, and by which arrangement of parts a mill may be used along' time, the difiiculty of removing a worn out ring and replacing itwith one not worn being quite inconsiderable.

Operation of my mill-The gold quartz rocks in suitable pieces are putinto the hopper, and the mill being put in motion by steam or otheradequate power descend grooves of the chilled concave and convex ringsE2 W, wherein the prisms and other shaped pieces of gold quartz are heldand whirled around with great speed and force against each other, untilreduced to such a degree of fineness as to permit the same to pass intothe radial shallow channels of the flat rings R X which revolve nearlyin contact with each other, wherein the fine gold quartz prisms arerubbed against each other until the particles of gold therewith mixed,shall be reduced to a fine powder, and thrown gradually from theperiphery of the revolving ring or plate X against the interior diameterof the circular curbrB from whence it descends to a receiver t beremoved and the gold separated from the quartz flour in the usualmanner.

From the foregoing description it will be perceived thatthe'pulverization of the gold quartz rock is not performed by ribs,projections, or edges of the iron runner, concave, rings or plates, butis effected 'by holding the pieces or particles of gold quartz in thegrooves of the semi-spherical concave E E2, and runner and between thehorizontal circular rubbing ring plates R, X, thus` `producing greatfrictional resistance, and

rubbing quartz against quartz until reduced to a fine dust powder orflour-the grooves in the upper portion of the cast runner and concaveare designed to yconduct the pieces of quartz to the grooves of thechilled rings as they are reduced to the proper fineness. In order toreduce the gold quartz to a still finer powder it is only necessary toturn the thumb screw c to the right which will have the effect ofraising the lever M, and with it the lower circular plate X toward the'upper plate R, between whose surfaces the operation of powdering thegold quartz takes place.

Having thus described my mill for reducing gold quartz rocks to a powderor flour, what I claim as new and desire to secure by Letters Patent, is

The combination of the chilled hollow cylinder R2, and nut S of the formrepresented, and the grooved chilled ringsW E2, and horizontal circularchanneled chilled ring plates R X, with the grooved concave E and'runnerT for breaking, pulverizing and powdering gold quartz rockthe saidchilled rings and plates being arranged and operating in the manner andfor the purpose herein fully set forth.

In testimony whereof I have hereunto signed my name before twosubscribing witnesses.

H. BLASDELL.

Witnesses P. F. PRUCKNEY, A. E. H. JoHNsoi'v.

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